Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4588eb273166cb…

MALICIOUS

PDF

122.6 KB Created: 2021-02-18 03:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: def3bbce90b7669a4d3d68df7bb8946b SHA-1: d4612ec717ddf2e0802719b37a01f27c65bade65 SHA-256: ec4588eb273166cb48be2bc9f2e00173f3aa491e8e564667555f324c31fe6818
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a lure to install a browser extension or update, a common social engineering tactic for malware delivery. It also embeds an external URI pointing to a suspicious domain, likely serving as a download or redirection point for a malicious payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/wix?keyword=thank+you+for+your+participation+in+spanish PDF link annotation
    • http://reduslim-italiaufficiale.site/dragon_age_elves_lifespanl8fu1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370063/normal_5fe1c6ddb7946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_6021f7e0e749a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ff382c417c36.pdfIn PDF document text
    • http://kfcrabota.ru/84744235521qutpl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391015/normal_5fcc2b0dc7140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448094/normal_5fec45f8193af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd14c6e4af71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fcc9e941dce5.pdfIn PDF document text
    • http://belplitka.ru/can_i_report_an_inactive_twitter_accountqaeja.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/dutuxelaje.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/office_id_card_template_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/80041170584.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/berkshire_hathaway_annual_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/adobe_photoshop_cc_tutorials.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/7165991869.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/tekovunajukagidek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018a9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18A9D 11192 bytes
SHA-256: 3e9721ee41efa5ec258c3a6e1585df635043e4c94c72a7dc441b7de3ed7d6377
font_00_sfnt_off00013178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13178 22380 bytes
SHA-256: dc7d64d793b2db83c72b972af377c70f3d5c83be999dff672a06646438333532
font_01_sfnt_off000178fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178FA 5184 bytes
SHA-256: 2cf16e278eae223017651471561fd13560565a5aa1360daf576585944cddb5c0
font_03_sfnt_off0001aa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA1A 17112 bytes
SHA-256: bd94aeaca8d6a2a446d16d5fd0456d4a6bf7c29f4cde4c4113d7a3bfcc37ab75

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